:root {
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f3f8;
  --text-primary: #1a1d26;
  --text-secondary: #4a5060;
  --text-muted: #8890a0;
  --accent-start: #6366f1;
  --accent-end: #a855f7;
  --accent-mid: #8b5cf6;
  --accent-solid: #7c3aed;
  --accent-glow: rgba(124, 58, 237, 0.25);
  --border-color: rgba(0, 0, 0, 0.06);
  --card-bg: rgba(255, 255, 255, 0.72);
  --card-border: rgba(255, 255, 255, 0.6);
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.7);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 8px 32px rgba(124, 58, 237, 0.18);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  --max-width: 1200px;
  --header-height: 72px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0f1117;
    --bg-secondary: #161922;
    --bg-tertiary: #1c2029;
    --text-primary: #eef0f6;
    --text-secondary: #a8b0c2;
    --text-muted: #6b7385;
    --border-color: rgba(255, 255, 255, 0.07);
    --card-bg: rgba(22, 25, 34, 0.75);
    --card-border: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(22, 25, 34, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --accent-glow: rgba(124, 58, 237, 0.35);
  }
}

[data-theme="dark"] {
  --bg-primary: #0f1117;
  --bg-secondary: #161922;
  --bg-tertiary: #1c2029;
  --text-primary: #eef0f6;
  --text-secondary: #a8b0c2;
  --text-muted: #6b7385;
  --border-color: rgba(255, 255, 255, 0.07);
  --card-bg: rgba(22, 25, 34, 0.75);
  --card-border: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(22, 25, 34, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --accent-glow: rgba(124, 58, 237, 0.35);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent-solid);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
  color: var(--accent-mid);
}

a:focus-visible {
  outline: 2px solid var(--accent-solid);
  outline-offset: 3px;
  border-radius: 4px;
}

ul, ol {
  padding-left: 1.4em;
}

li {
  margin-bottom: 0.4em;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.6rem;
}

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  margin-top: 1.8rem;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

h4 {
  font-size: 1.05rem;
  margin-top: 1.2rem;
  margin-bottom: 0.4rem;
  color: var(--text-secondary);
}

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

address {
  font-style: normal;
  line-height: 1.9;
}

address p {
  margin-bottom: 0.3rem;
}

::selection {
  background-color: var(--accent-glow);
  color: var(--text-primary);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

header[role="banner"]:hover {
  box-shadow: var(--shadow-md);
}

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

header nav > a:first-child {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  white-space: nowrap;
  transition: transform var(--transition-bounce), filter var(--transition-fast);
  flex-shrink: 0;
}

header nav > a:first-child:hover {
  transform: scale(1.06);
  filter: brightness(1.15);
}

header nav > button[aria-label="打开移动菜单"] {
  display: none;
}

header nav ul {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 2px;
  flex-wrap: wrap;
  flex: 1;
  justify-content: center;
}

header nav ul li {
  margin: 0;
}

header nav ul li a {
  display: block;
  padding: 8px 12px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

header nav ul li a::before {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  border-radius: 1px;
  background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
  transition: transform var(--transition-smooth);
}

header nav ul li a:hover {
  color: var(--accent-solid);
  background: var(--bg-tertiary);
  transform: translateY(-1px);
}

header nav ul li a:hover::before {
  transform: translateX(-50%) scaleX(1);
}

header nav form[role="search"] {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

header nav form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

header nav form[role="search"] input[type="search"] {
  width: 180px;
  padding: 8px 14px;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  outline: none;
  transition: width var(--transition-smooth), border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

header nav form[role="search"] input[type="search"]::placeholder {
  color: var(--text-muted);
}

header nav form[role="search"] input[type="search"]:focus {
  width: 220px;
  border-color: var(--accent-solid);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: var(--bg-secondary);
}

header nav form[role="search"] button[type="submit"] {
  padding: 8px 16px;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
  white-space: nowrap;
}

header nav form[role="search"] button[type="submit"]:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
  filter: brightness(1.1);
}

header nav form[role="search"] button[type="submit"]:active {
  transform: translateY(0) scale(0.97);
}

header nav > button[aria-label="切换暗黑模式"] {
  padding: 8px 14px;
  font-size: 0.82rem;
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}

header nav > button[aria-label="切换暗黑模式"]:hover {
  color: var(--accent-solid);
  border-color: var(--accent-solid);
  background: var(--bg-secondary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

main {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 64px;
}

main > section {
  padding: 56px 0;
  opacity: 0;
  transform: translateY(32px);
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

main > section:nth-child(1) { animation-delay: 0.05s; }
main > section:nth-child(2) { animation-delay: 0.1s; }
main > section:nth-child(3) { animation-delay: 0.15s; }
main > section:nth-child(4) { animation-delay: 0.2s; }
main > section:nth-child(5) { animation-delay: 0.25s; }
main > section:nth-child(6) { animation-delay: 0.3s; }
main > section:nth-child(7) { animation-delay: 0.35s; }
main > section:nth-child(8) { animation-delay: 0.4s; }
main > section:nth-child(9) { animation-delay: 0.45s; }
main > section:nth-child(10) { animation-delay: 0.5s; }
main > section:nth-child(11) { animation-delay: 0.55s; }
main > section:nth-child(12) { animation-delay: 0.6s; }

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-16px) rotate(3deg); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { box-shadow: 0 0 0 12px transparent; }
}

#home {
  position: relative;
  padding: 72px 0 56px;
  text-align: center;
  overflow: hidden;
}

#home::before {
  content: "";
  position: absolute;
  top: -40%;
  left: -20%;
  width: 140%;
  height: 180%;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(99, 102, 241, 0.12) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 20%, rgba(168, 85, 247, 0.12) 0%, transparent 55%),
    radial-gradient(ellipse at 50% 80%, rgba(139, 92, 246, 0.08) 0%, transparent 60%);
  z-index: -1;
  animation: floatBg 18s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes floatBg {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(3%, -3%) scale(1.06); }
}

#home h1 {
  background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-mid) 40%, var(--accent-end) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 1.4rem;
  animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
}

#home > p {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.05rem;
  animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

#home > p:nth-of-type(1) { animation-delay: 0.2s; }
#home > p:nth-of-type(2) { animation-delay: 0.3s; }
#home > p:nth-of-type(3) { animation-delay: 0.4s; }

#home figure {
  margin: 2.5rem auto 0;
  max-width: 720px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
  animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.5s both;
}

#home figure:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-lg), 0 12px 48px rgba(124, 58, 237, 0.25);
}

#home figure img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-smooth);
}

#home figure:hover img {
  transform: scale(1.02);
}

#home figcaption {
  padding: 14px 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-top: 1px solid var(--border-color);
}

#about,
#products,
#solutions,
#cases,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links,
#legal {
  position: relative;
}

#about > p,
#products > p,
#solutions > p,
#cases > p,
#news > p,
#articles > p {
  max-width: 820px;
}

#about h3,
#products h3,
#solutions h3,
#cases h3,
#news h3,
#articles h3,
#faq h3,
#howto h3,
#contact h3,
#legal h3 {
  display: flex;
  align-items: center;
  gap: 10px;
}

#about h3::before,
#products h3::before,
#solutions h3::before,
#cases h3::before,
#news h3::before,
#articles h3::before,
#faq h3::before,
#howto h3::before,
#contact h3::before,
#legal h3::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  flex-shrink: 0;
  box-shadow: 0 0 8px var(--accent-glow);
}

#about address {
  margin-top: 1.5rem;
  padding: 24px 28px;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-smooth), transform var(--transition-smooth);
}

#about address:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

#about address p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

#about address p:first-child {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1.05rem;
  margin-bottom: 0.6rem;
}

#products h3 {
  margin-top: 2rem;
  padding: 20px 24px;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

#products h3:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  border-color: var(--accent-solid);
}

#products h4 {
  margin-left: 30px;
  padding: 10px 16px;
  border-left: 3px solid var(--accent-solid);
  background: var(--bg-tertiary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.95rem;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

#products h4:hover {
  border-left-color: var(--accent-end);
  background: var(--glass-bg);
}

#products h4 + p {
  margin-left: 30px;
  font-size: 0.95rem;
}

#solutions ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  list-style: none;
  padding: 0;
  margin-top: 1.5rem;
}

#solutions ul li {
  padding: 18px 22px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

#solutions ul li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-smooth);
}

#solutions ul li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-solid);
}

#solutions ul li:hover::before {
  transform: scaleX(1);
}

#cases h3 {
  margin-top: 2rem;
  padding: 22px 26px;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

#cases h3:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

#cases p {
  padding-left: 8px;
}

#cases p:last-of-type {
  font-style: italic;
  color: var(--accent-solid);
  font-weight: 500;
}

#cases ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  list-style: none;
  padding: 0;
  margin-top: 1.5rem;
}

#cases ul li {
  padding: 16px 20px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: 0.92rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 44px;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

#cases ul li::before {
  content: "❝";
  position: absolute;
  left: 16px;
  top: 14px;
  font-size: 1.3rem;
  line-height: 1;
  color: var(--accent-solid);
  opacity: 0.5;
}

#cases ul li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

#news h3 {
  margin-top: 1.8rem;
  padding: 20px 24px;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

#news h3:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  border-color: var(--accent-solid);
}

#news h3 + p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-left: 30px;
  margin-bottom: 0.4rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

#news h3 + p + p {
  margin-left: 30px;
  font-size: 0.95rem;
}

#articles article {
  margin-top: 1.5rem;
  padding: 24px 28px;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent-start), var(--accent-end));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition-smooth);
}

#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  border-color: var(--accent-solid);
}

#articles article:hover::before {
  transform: scaleY(1);
}

#articles article h3 {
  margin-top: 0;
  font-size: 1.08rem;
  color: var(--text-primary);
}

#articles article h3::before {
  display: none;
}

#articles article p {
  font-size: 0.92rem;
}

#articles article p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-solid);
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--bg-tertiary);
  transition: all var(--transition-fast);
}

#articles article a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  box-shadow: var(--shadow-glow);
  transform: translateX(3px);
}

#faq h3 {
  margin-top: 1.6rem;
  padding: 18px 24px;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  box-shadow: var(--shadow-sm);
  font-size: 1.02rem;
  cursor: default;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

#faq h3:hover {
  background: var(--glass-bg);
  border-color: var(--accent-solid);
}

#faq h3::before {
  content: "Q";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: #fff;
  font-size: 0.7rem;
  font-weight: 800;
  flex-shrink: 0;
  box-shadow: 0 0 8px var(--accent-glow);
}

#faq h3 + p {
  margin-top: 0;
  padding: 18px 24px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  font-size: 0.95rem;
  transition: background var(--transition-fast);
}

#faq h3 + p:hover {
  background: var(--glass-bg);
}

#howto ul,
#howto ol {
  padding-left: 1.2em;
}

#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
  margin-top: 1rem;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 14px 20px 14px 56px;
  margin-bottom: 10px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: #fff;
  font-size: 0.78rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px var(--accent-glow);
}

#howto ol li:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-solid);
}

#howto ul li {
  padding: 8px 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
  position: relative;
  list-style: none;
  padding-left: 24px;
}

#howto ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  box-shadow: 0 0 6px var(--accent-glow);
}

#howto h3:last-of-type + p {
  padding: 20px 24px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: 0.95rem;
}

#contact address {
  margin-top: 1.5rem;
  padding: 28px 32px;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-smooth), transform var(--transition-smooth);
}

#contact address:hover {
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: translateY(-3px);
}

#contact address p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

#contact address p:first-child {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1.1rem;
  margin-bottom: 0.6rem;
}

#contact h3 {
  margin-top: 2rem;
}

#contact h3 + p {
  padding: 16px 22px;
  background: var(--bg-tertiary);
  border-left: 3px solid var(--accent-solid);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.95rem;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

#contact h3 + p:hover {
  border-left-color: var(--accent-end);
  background: var(--glass-bg);
}

#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin-top: 1rem;
}

#sitemap ul li,
#links ul li {
  margin: 0;
}

#sitemap ul li a,
#links ul li a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  border-color: transparent;
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

#legal h3 {
  margin-top: 1.6rem;
}

#legal h3 + p {
  padding: 16px 22px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 0.93rem;
  transition: background var(--transition-fast);
}

#legal h3 + p:hover {
  background: var(--glass-bg);
}

footer[role="contentinfo"] {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 48px 24px 32px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: background var(--transition-smooth), border-color var(--transition-smooth);
}

footer[role="contentinfo"]::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-start), var(--accent-mid), var(--accent-end));
  background-size: 200% 100%;
  animation: shimmer 4s linear infinite;
}

footer[role="contentinfo"] > p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

footer[role="contentinfo"] > p:first-of-type {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

footer nav[aria-label="页脚导航"] {
  margin-top: 1.5rem;
}

footer nav[aria-label="页脚导航"] ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  list-style: none;
  padding: 0;
}

footer nav[aria-label="页脚导航"] ul li {
  margin: 0;
}

footer nav[aria-label="页脚导航"] ul li a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-radius: 999px;
  transition: all var(--transition-fast);
}

footer nav[aria-label="页脚导航"] ul li a:hover {
  color: var(--accent-solid);
  background: var(--bg-tertiary);
  transform: translateY(-1px);
}

body > button[aria-label="返回顶部"],
#app > button[aria-label="返回顶部"] {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(14px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  color: var(--text-secondary);
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  line-height: 1.2;
  padding: 0;
  opacity: 0.85;
}

body > button[aria-label="返回顶部"]:hover,
#app > button[aria-label="返回顶部"]:hover {
  opacity: 1;
  transform: translateY(-4px) scale(1.06);
  color: #fff;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

body > button[aria-label="返回顶部"]:active,
#app > button[aria-label="返回顶部"]:active {
  transform: translateY(-2px) scale(0.98);
}

@media (max-width: 1024px) {
  header nav {
    padding: 0 16px;
    gap: 10px;
  }

  header nav ul {
    gap: 0;
  }

  header nav ul li a {
    padding: 7px 9px;
    font-size: 0.82rem;
  }

  header nav form[role="search"] input[type="search"] {
    width: 140px;
  }

  header nav form[role="search"] input[type="search"]:focus {
    width: 170px;
  }

  main {
    padding: 0 16px 48px;
  }

  main > section {
    padding: 44px 0;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  header nav {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 16px;
    gap: 8px;
  }

  header nav > a:first-child {
    font-size: 1.15rem;
  }

  header nav > button[aria-label="打开移动菜单"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 7px 14px;
    font-size: 0.82rem;
    font-family: var(--font-sans);
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    cursor: pointer;
    order: 3;
    transition: all var(--transition-fast);
  }

  header nav > button[aria-label="打开移动菜单"]:hover {
    color: var(--accent-solid);
    border-color: var(--accent-solid);
  }

  header nav ul {
    order: 5;
    width: 100%;
    flex-direction: column;
    gap: 2px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--transition-smooth), opacity var(--transition-smooth), padding var(--transition-smooth);
    padding: 0;
  }

  header nav ul.is-open,
  header nav[aria-expanded="true"] ul {
    max-height: 600px;
    opacity: 1;
    padding: 8px 0;
  }

  header nav ul li a {
    padding: 10px 14px;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
  }

  header nav ul li a::before {
    display: none;
  }

  header nav form[role="search"] {
    order: 4;
    flex: 1;
    min-width: 0;
  }

  header nav form[role="search"] input[type="search"] {
    width: 100%;
    min-width: 0;
  }

  header nav form[role="search"] input[type="search"]:focus {
    width: 100%;
  }

  header nav > button[aria-label="切换暗黑模式"] {
    order: 2;
    padding: 7px 12px;
    font-size: 0.78rem;
  }

  main {
    padding: 0 16px 40px;
  }

  main > section {
    padding: 36px 0;
  }

  #home {
    padding: 48px 0 36px;
  }

  #home > p {
    font-size: 0.98rem;
  }

  #home figure {
    border-radius: var(--radius-md);
  }

  h2::after {
    width: 40px;
    height: 3px;
  }

  #solutions ul,
  #cases ul {
    grid-template-columns: 1fr;
  }

  #products h3 {
    padding: 16px 18px;
  }

  #products h4,
  #products h4 + p {
    margin-left: 16px;
  }

  #articles article {
    padding: 20px 20px;
  }

  #faq h3 {
    padding: 16px 18px;
    font-size: 0.96rem;
  }

  #faq h3 + p {
    padding: 16px 18px;
    font-size: 0.9rem;
  }

  #contact address {
    padding: 22px 24px;
  }

  #howto ol li {
    padding: 12px 16px 12px 50px;
    font-size: 0.9rem;
  }

  footer[role="contentinfo"] {
    padding: 36px 16px 28px;
  }

  body > button[aria-label="返回顶部"],
  #app > button[aria-label="返回顶部"] {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 0.62rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  header nav > a:first-child {
    font-size: 1.05rem;
  }

  header nav form[role="search"] button[type="submit"] {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  main {
    padding: 0 12px 32px;
  }

  main > section {
    padding: 28px 0;
  }

  #home {
    padding: 36px 0 28px;
  }

  #home h1 {
    font-size: 1.5rem;
  }

  #home > p {
    font-size: 0.92rem;
  }

  #home figure figcaption {
    padding: 10px 14px;
    font-size: 0.78rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1.05rem;
  }

  #solutions ul li {
    padding: 14px 16px;
  }

  #cases ul li {
    padding: 12px 14px 12px 38px;
    font-size: 0.85rem;
  }

  #cases ul li::before {
    left: 12px;
    font-size: 1.1rem;
  }

  #articles article h3 {
    font-size: 0.98rem;
  }

  #articles article p {
    font-size: 0.85rem;
  }

  #howto ol li {
    padding: 10px 12px 10px 44px;
    font-size: 0.85rem;
  }

  #howto ol li::before {
    left: 12px;
    width: 24px;
    height: 24px;
    font-size: 0.7rem;
  }

  #sitemap ul li a,
  #links ul li a {
    padding: 6px 14px;
    font-size: 0.8rem;
  }

  footer nav[aria-label="页脚导航"] ul li a {
    padding: 5px 10px;
    font-size: 0.76rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  main > section {
    opacity: 1;
    transform: none;
  }
}

@media print {
  header[role="banner"],
  footer[role="contentinfo"],
  body > button[aria-label="返回顶部"],
  #app > button[aria-label="返回顶部"] {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  main > section {
    opacity: 1;
    transform: none;
    padding: 16px 0;
    page-break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}